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My personal favorite is an Ultrasonic Leak detector. They're pricey but, worth every cent. Once I learned how to listen with it, I've only had one leak in the last 5 years be missed. And that was because of ambient noise and my trouble hearing in very noisy environments. Every other one I've gone right to it, never fail. It's my GOTO detector!
I also have a CPS L790A that does OK but, it will confuse in a contaminated atmosphere and it does react to moisture and some other materials.
Nitrogen and Soapy stuff never lets me down!

Two things are infinite: the universe and human stupidity; and Im not sure about the universe. Albert Einstein